it's amazing what ppl have done.* Now imagine if this was
  marketed as a tool for construction or architects and was sold
  for thousands of dollars (without the game elements and such)?*
  But that's the marvel of it; for quick prototyping of a concept,
  it's perfect - and it has the flexibility to get things
  absolutely perfect as well. Instead of drawing and rendering and
  complicated annoying meshes and things, you can just go in and
  get started.* Not so much for what it is now, but for what it
  can become in years from now.* I've told ppl many times, "It's
  Minecraft 30 I want to see" [or whatever similar thing will be
  around then]. People get stuck on the 'look and feel' but dont'
  realize the raw power behind it.     I feel bad though -
  [1]http://www.planetminecraft.com/server/kens-142-creative-server/
  my server has been down since September 2014, after 23 months
  straight.* Got 56 diamonds... had 27000 unique players visiting
  total with many dedicated players.. who still ask when I'm
  putting it back up again. I always promised them I'd never shut
  it down but I did.* I'll keep my promise one day, find them and
  at least send them their creations somehow.* Maybe not all
  27,000 [because some just came in, went UGH I HATE CREATIVE and
  left), but there's at least a few thousand that were dedicated,
  on and off through the time.

References

  Visible links
  1. http://www.planetminecraft.com/server/kens-142-creative-server/